JP3977700B2 - Demolition and new construction method using existing underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a dismantling and a new construction method using an existing underground structure for streamlining construction, particularly in an underground construction part, when a building such as an urban area is dismantled and newly constructed.
[0002]
[Prior art]
When dismantling buildings such as urban areas and newly constructing them, it may not be possible to construct a new construction by dismantling the existing underground building full of the site. Is proposed.
[0003]
The problems in that case are as follows: (1) As the underground structure progresses, the buoyancy becomes prominent at a certain stage and floats. (2) When the slab is disassembled, the outer wall as the mountain retaining wall collapses due to a decrease in the support points of the outer wall.
[0004]
Therefore, in order to cope with buoyancy, there is a demand for a construction method that maintains the support point of the outer wall while ensuring the soundness of the existing underground outer peripheral wall while replacing the weight of the existing structure from the existing structure to the new structure.
[0005]
In order to respond to such a request, there is a 1F floor advance construction method in which the 1F floor is constructed in advance as a basic procedure of the reverse driving method. By constructing the 1F floor in advance, it is possible to secure a working yard and a scaffold for upper steel work. In this 1F floor advance construction method, the following construction flow is used.
[0006]
1) After the completion of the B1 rising dismantling ground roof dismantling work, the equipment in the basement is carried out, the frame is installed on the existing 1F floor, and the partition wall is dismantled in advance.
2) Construction column / 1G beam construction This is the construction of the main sub-frame.
3) 1F floor new frame with 1F floor new frame hanging formwork is constructed by backlashing.
4) B2 rising dismantling Existing B2F wall, B1 floor dismantling 5) B1G building 6) B1 floor new frame 7) Cut beam installation (on B2 floor)
8) B3 rising dismantling 9) B2 floor new body
10) B4 rising dismantling
11) B3 rising new body
12) Cutting beam dismantling
13) B1 and B2 and B3 after the rising edge (reverse strike)
[0007]
In this 1F floor advance construction method, as described above, the 1F floor frame is completed at an early stage. Therefore, the tower crane can be installed on the 1F floor because it can be used as a work yard. The dismantling and construction of the 1F floor (while securing the guard) has a large process loss, and the 1F slab interferes with the work on the lower floor, and it is necessary to install the entire surface of the beam. However, there is a drawback that cannot be secured.
[0008]
In addition, B3 dismantling is narrow under the beam, and B2 dismantling cannot be done unless the strength of the 1F floor joint is strong (outer wall fulcrum), the B1 floor construction scaffolding needs to be raised from the B3 floor, The distance between the fulcrum of the outer wall to the mat is large. When the subway is built, four layers of drilling of the existing frame are required, and the pillar walls of the three floors B1, B2, and B3 become the post-casting frame (increase in the reverse strike range) There are also downsides.
[0009]
On the other hand, the following island / zero-stage beam construction method has been studied as one that can complete the center 1F floor at an early stage and secure it as a work yard and has a small range of beam beams, and is shown in FIGS.
[0010]
As shown in FIG. 18, the new mat housing 1 is preliminarily constructed, the east-west tower crane 2 is installed (supported from the new mat housing 1), and the central east B1 and B2 are disassembled.
[0011]
As shown in FIG. 19, the central east structure true pillar 3 as the main pillar is built by dismantling the central west B1 and B2 and drilling the existing floor. As shown in FIG. 20, the outer periphery B1 is disassembled, the steel frame is erected on the B1 floor of the central east, and the floor / beam frame (supported from the old frame B2 and backlashed) is constructed on the B1 floor of the central east.
[0012]
As shown in FIG. 21, the B1 floor beam steel frame is built by constructing the central west frame column 3, and the B1 wall / slab frame (supported from the new B1 and ordered) ). As shown in FIG. 22, a central west B1 floor beam structure (supported from the old B2, backlashed) is constructed.
[0013]
Next, as shown in FIG. 23, the central west B1 wall / slab frame is constructed, and the central east B1 support construction is dismantled. Start using 1F floor as Yard 5.
[0014]
As shown in FIG. 24, the construction pillar 3 and the zero-stage beam 4 on the west outer periphery are installed, and the dismantling of the east outer periphery B2 and the oblique beam 6 are installed.
[0015]
As shown in FIG. 25, west B2 is dismantled, as shown in FIG. 26, the east-west outer periphery B1 floor beam frame is constructed, and as shown in FIG. As shown in FIG. 28, the east / west outer periphery B1 wall slab frame is constructed, and as shown in FIG. 29, the central portion B3F is dismantled (after completion of the B2F formwork support dismantling and dismantling).
[0016]
As shown in FIG. 30, the east-west outer peripheral part B3F is dismantled, and as shown in FIG. 31, a B2 floor beam frame (supported from the old B3, strikes back) is constructed, and the ground steel work is started.
[0017]
As shown in FIG. 32, the support work on the B3 floor is dismantled and the ground work continues. As shown in FIG. 33, the old B3 (B4) is dismantled and the ground work continues. As shown in FIG. 34, the old B3 (B4) is dismantled and the ground work continues.
[0018]
B2 and B3 post-casting construction is performed, and the construction of the underground post-casting construction is completed.
[0019]
[Problems to be solved by the invention]
18 to 34 shown in FIGS. 18 to 34, as described above, the center 1F floor can be completed early and secured as a work yard, and the range of cut beams is small. In addition, underground steel beam construction, beam cutting work can be done with a crane on the ground, B1 and part B3 frame can be constructed in order (B2 and B3 column walls on 2 floors are post-casting ranges ) Formwork support work on each floor is possible at a height of one floor, frame scaffolding on each basement floor is possible with a stepladder, B3 and B4 dismantling work can secure a stroke of two floors, B1・ B2 can be dismantled open.
[0020]
However, firstly, it is impossible to secure the work flow line of the other work area until the center 1F slab is completed, and secondly, the work period until the entire 1F floor is completed (delay of the ground steel frame start), thirdly , B1 and B2 dismantling work has a drawback that it can not continue.
[0021]
The object of the present invention is to solve the disadvantages of the 1F floor advance construction method and the island / zero-stage beam construction method, to secure a stable work floor, advantageous to earth pressure, and to have a good dismantling efficiency. The purpose is to provide dismantling and new construction methods using the existing underground structures.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the present invention constructs a new mat frame in advance, leaves the upper floor of the existing underground frame as an alternative to the cut beam, disassembles it open, drills the existing floor A built-up column is built as a building column, and the first-floor ground floor and underground 1st-floor steel frame is built based on this built-up column. Furthermore, a gantry is built and a zero-stage beam is built only on the outer periphery. Then, the gist is to perform the construction of the old building and the new building of the floor one floor at a time.
[0023]
According to the present invention, the mat body leads to gain weight as a countermeasure against the buoyancy of the underground body, the underground body procedure can be advantageously advanced, a stable work floor can be obtained by installing the gantry, and the body A work yard that does not depend on the progress can be secured, and the construction of the underground steel beam and the beam work on the ground is reduced by installing 0-stage beams on the outer circumference and dismantling the old and new floor frames one floor at a time. In addition to this, the range of backlash can be reduced, the height of the formwork support work can be low, the frame scaffolding can be as low as a stepladder, and the disassembly work can be facilitated.
Specifically, it is as follows.
・ Work yard that is not affected by the progress of the frame can be secured. ・ The range of cutting beams is small. ・ The underground steel beam construction and the beam cutting work can be done with the ground crane. ・ B1 and some B3 frames can be constructed in order (B2 / B3) (The two-floor pillar wall will be the post-casting frame, reducing the range of backlashing)
-Formwork support on each basement floor can be constructed at the height of one floor-The scaffolding on each basement floor can be built with a stepladder-B3 and B4 disassembly work can secure a stroke of two floors-B1 and B2 disassembly Can be done open. [0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. 1-17 is explanatory drawing of each process which shows one Embodiment of the dismantling using the existing underground skeleton of this invention, and a new construction method, FIG. 18-34 which shows the island and 0 stage cut beam method which is the said comparative construction method. The same components are denoted by the same reference numerals. As an outline of the construction, there is an underground structure of the old building on the 4th floor underground, and this is a case where a newly built building with 3 floors underground and 10 floors above ground is built.
[0025]
As shown in FIG. 1, the new mat frame 1 is constructed in advance, and the east-west tower crane 2 is supported by the new mat frame 1 and installed. West B1 and B2 are left open and dismantled, leaving one span of the outer periphery of the existing frame as a substitute for the beam. The reason why the new mat frame 1 is preceded by the underground demolition work is to advance the underground construction advantageously for buoyancy and to reduce the distance between the outer wall fulcrums during the old B3 floor demolition. .
[0026]
As described above, by using open dismantling up to B2F, large heavy machinery can be used during B2F dismantling. In addition, the dismantling material can be easily separated and carried out, and the working efficiency is greatly improved. (The work at the lower part of the preceding floor frame, which has poor workability, can be greatly reduced.) In addition, in the steel frame construction of the underground part, there is no obstacle using a tower crane from the ground. It becomes construction, and workability and construction accuracy can be secured. Moreover, in the underground frame construction above the B1 floor, the material can be easily carried in and out.
[0027]
As shown in FIG. 2, the construction floor 3 which is a west main pillar is built by drilling the existing floor which is an interference part of the existing frame, and the steel frame construction of the 1G / B1G subway frame is performed.
[0028]
As shown in FIG. 3, it is supported from the new mat 1 and is reinforced with anti-friction from the existing B2 and B3 floors, and the west gantry 7 is assembled to the level above 1FL. The remaining B2 is dismantled. The support for the gantry will be a new mat frame, which will be drilled in the existing frame in the same way as the steel frame, and the support columns will be built.
[0029]
As shown in FIG. 4, the erection beam and buttress wall are installed as the outer wall reinforcement 8 to dismantle the central parts B1 and B2, and the eastern pillar 3 (main pillar) is installed as shown in FIG. 1G and B1G steel frame construction is performed and the east gantry 7 is assembled.
[0030]
In the case of the general reverse construction method, the use of the ground floor gantry is normal. However, in the case of reverse strike dismantling, it is necessary to emphasize the efficiency of the dismantling work and the simultaneous construction of the new frame. Therefore, the minimum gantry 7 was decided to be installed in advance. By installing prior to the 1F floor frame, construction can be performed continuously without interfering with the steps of demolition work and frame work, and the gantry 7 can be used as a separation yard and loading yard. In addition, although the useless hole of a support pillar remains in the floor frame of B1F and 1F, if the steady rest is constructed using the existing B2 floor and B3 floor, labor can be saved.
[0031]
As shown in FIG. 6, the remaining steel frame in the basement of the outer periphery is constructed, and the outer periphery 0-stage beam 4 is constructed. As shown in FIG. 7, the disassembly of the outer periphery B2F, the center B1F floor beam frame (old B2 More support, reverse strike).
[0032]
The cutting beam was made of a steel frame and only the outer periphery. After completion of piercing of the beam, dismantling of the remaining 1 span of the outer periphery. Reinforce the outer wall of the existing outer wall where the bar arrangement is unknown and where the strength is insufficient.
[0033]
As shown in FIG. 8, the outer peripheral part B1F floor beam frame (reverse strike) is constructed, and the central part B1F wall / slab frame (supported from the new B1 floor, forward strike) is constructed. As shown in FIG. The stepped beam 4 is disassembled.
[0034]
In this way, the existing B2F is supported by the formwork support, the B1F beam / floor frame is newly set as a support point of the outer wall (reverse hitting), and then the B1F rising frame is newly set by forward hitting. The zero-stage beam will be dismantled at this point and the outer frame will be constructed.
[0035]
As shown in FIG. 10, the wall slab housing of the outer periphery B1 is constructed, and after checking the strength of the 1F floor as shown in FIG. 11, the gantry 7 is disassembled, the supporting work of B1 and B2 is dismantled, and the old B3 Dismantle the body rise. In addition, an upset beam / buttress wall is installed on the outer wall of B3F.
[0036]
As shown in FIG. 12, the construction of the ground steel frame is started, and as shown in FIG. 13, the B2 floor beam frame (supported from the old B3 floor, backlash) is constructed, and the ground steel construction is continued.
[0037]
As shown in FIG. 14, the support work of B3 is dismantled, and the old housing of B4 is dismantled. In addition, a B2 post-casting frame was constructed, and a B3 floor frame (lower parking pit and water tank, etc., in order from the mat) was constructed as shown in FIGS. 15 and 16, and as shown in FIG. After the construction, the temporary building on each basement floor is closed and the underground building is completed.
[0038]
【The invention's effect】
As described above, the dismantling and new construction method using the existing underground structure of the present invention eliminates the disadvantages of the 1F floor advance construction method and the island / zero-stage beam construction method, secures a stable work floor, Is advantageous, and a construction method with high disassembly efficiency can be obtained, and the following effects can be exhibited.
(1) Underground buoyancy countermeasure mats The weight of the mat can be increased by the advance of the mat body, and the underground body procedure can be advantageously advanced. A new building can be constructed and can be successfully replaced with the weight of the dismantled body.
(2) Water pressure countermeasures By adopting a zero-stage beam, work in a confined space under the beam can be reduced. In addition, large heavy machinery can be used even during demolition work, which reduces labor. In addition, by adopting the reverse driving method, an alternate cycle of dismantling work and new construction work can be established to make an effective existing outer wall support point, and the soundness of the existing outer wall as a retaining wall can be secured.
(3) Securing the work yard Despite the adoption of the counter-striking method, it is possible to proceed with the underground work without disturbing the flow of the process for both the dismantling work and the new construction work by intentionally installing the gantry.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of a first step showing one embodiment of a dismantling and a new construction method using an existing underground structure of the present invention.
FIG. 2 is an explanatory diagram of a second step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 3 is an explanatory diagram of a third step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 4 is an explanatory diagram of a fourth step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 5 is an explanatory diagram of a fifth step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 6 is an explanatory diagram of a sixth step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 7 is an explanatory diagram of a seventh step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 8 is an explanatory diagram of an eighth step showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 9 is an explanatory diagram of a ninth step showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 10 is an explanatory diagram of a tenth step showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 11 is an explanatory diagram of an eleventh step showing one embodiment of the dismantling and new construction method using the existing underground structure of the present invention.
FIG. 12 is an explanatory diagram of a twelfth process showing one embodiment of the dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 13 is an explanatory diagram of a thirteenth process showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 14 is an explanatory view of a fourteenth step showing one embodiment of the dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 15 is an explanatory diagram of a fifteenth step showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 16 is an explanatory view of a sixteenth step showing one embodiment of the dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 17 is an explanatory view of a seventeenth step showing one embodiment of dismantling and new construction method using the existing underground skeleton of the present invention.
FIG. 18 is an explanatory diagram showing a first step of an island zero-stage beam construction method as an alternative study plan.
FIG. 19 is an explanatory diagram showing a second step of the island / zero-stage beam construction method as an alternative study plan.
FIG. 20 is an explanatory diagram showing a third step of the island / zero-stage beam construction method as an alternative study plan.
FIG. 21 is an explanatory diagram showing a fourth step of the island zero-stage beam construction method as an alternative study plan.
FIG. 22 is an explanatory diagram showing a fifth step of the island zero-stage beam construction method as an alternative study plan.
FIG. 23 is an explanatory diagram showing a sixth step of the island zero-stage beam construction method as an alternative study plan.
FIG. 24 is an explanatory diagram showing a seventh step of an island / zero-stage beam construction method as an alternative study plan.
FIG. 25 is an explanatory diagram showing an eighth step of an island / zero-stage beam construction method as an alternative study plan.
FIG. 26 is an explanatory diagram showing a ninth step of the island 0-stage beam method as an alternative study plan.
FIG. 27 is an explanatory diagram showing a tenth step of an island zero-stage beam construction method as an alternative study plan.
FIG. 28 is an explanatory diagram showing an eleventh step of an island / zero-stage beam construction method as an alternative study plan.
FIG. 29 is an explanatory diagram showing a twelfth step of an island / zero-stage beam construction method as an alternative study plan.
FIG. 30 is an explanatory diagram showing a thirteenth step of an island zero-stage beam construction method as an alternative study plan.
FIG. 31 is an explanatory diagram showing a 14th step of an island 0-stage beam method as an alternative study plan.
FIG. 32 is an explanatory diagram showing a fifteenth step of the island zero-stage beam construction method as an alternative study plan.
FIG. 33 is an explanatory diagram showing a sixteenth step of an island zero-stage beam construction method as an alternative study plan.
FIG. 34 is an explanatory diagram showing a seventeenth step of an island / zero-stage beam construction method as an alternative study plan.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Newly installed mat frame 2 ... Tower crane 3 ... Structural pillar 4 ... 0-stage beam 5 ... Yard 6 ... Oblique beam 7 ... Gantry 8 ... Exterior wall reinforcement

Claims (1)

A new mat frame was constructed in advance, and the upper floor of the existing underground frame was left open as a beam instead of a beam, dismantled open, drilled into the existing floor, and a built-up column as a main column was built. Based on this structural pillar, the first-floor ground floor and the first basement steel frame will be built, the base will be erected, the 0-step beam will be erected only on the outer periphery, and then the floor will be lowered to the basement in sequence. Demolition and new construction methods using existing underground structures, characterized by the construction of old and new floor structures.

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